Calgary gas prices dipped to as low as 92.9 cents per litre at Costco. The rest of the city is between 94.9 cents and 97.9 cents per litre. Cochrane gas prices at the low end are 97.9 cents per litre in Sunset to 99.9 cents per litre throughout the rest of town, according to GasBusddy.com at 9:30 a.m.